Well I got in my jeep the other day I turned the heat on and it come on but I tried to turn up the hi/lo switch and nothing has anyone experienced this.

 

Does the fan come on at all?if not it could be anything from a blown fuse,resistor,or bad fan,would need to check the fuse,the fan you can test by hooking it up to the battery to see if it runs,I would try those items first and go from there.

 

Yea it blows heat it just the hi/lo switch will not blow speeds it's just on low

 

It is probably the resistor behind the glove box. It controls the fan speed depending on the setting.